/Engine/Source/Editor/EditorWidgets/Public/Filters/SAssetFilterBar.h
Set the check box state of the specified filter (in the filter drop down) and pin/unpin a filter widget on/from the filter bar. When a filter is pinned (was not already pinned), it is activated if requested and deactivated when unpinned.
void SetAssetTypeFilterCheckState ( const [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) & InClassPath, ECheckBoxState InCheckState, bool bEnableFilter )